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| author | Sifan Naeem <sifan.naeem@imgtec.com> | 2015-09-10 16:50:06 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2015-10-10 09:39:45 +0200 |
| commit | 1ed6faedfc9741cca2d97b25ab73902ba7177093 (patch) | |
| tree | 6198033da1ed980428b5e61d08923b4f58c0d988 /drivers/i2c | |
| parent | i2c: img-scb: use line_status instead of i2c->line_status (diff) | |
| download | linux-1ed6faedfc9741cca2d97b25ab73902ba7177093.tar.xz linux-1ed6faedfc9741cca2d97b25ab73902ba7177093.zip | |
i2c: img-scb: Clear line and interrupt status before starting a transfer
Clear line status and all generated interrupts from the interrupt
status register before starting a transfer, as we may have
unserviced interrupts from previous transfers that might be
handled in the context of the new transfer.
Fixes: commit 27bce457d588 ("i2c: img-scb: Add Imagination Technologies I2C SCB driver")
Signed-off-by: Sifan Naeem <sifan.naeem@imgtec.com>
Acked-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: James Hartley <james.hartley@imgtec.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-img-scb.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c index 049d193d01ac..0fa47158dbe4 100644 --- a/drivers/i2c/busses/i2c-img-scb.c +++ b/drivers/i2c/busses/i2c-img-scb.c @@ -1060,6 +1060,15 @@ static int img_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, i2c->last_msg = (i == num - 1); reinit_completion(&i2c->msg_complete); + /* + * Clear line status and all interrupts before starting a + * transfer, as we may have unserviced interrupts from + * previous transfers that might be handled in the context + * of the new transfer. + */ + img_i2c_writel(i2c, SCB_INT_CLEAR_REG, ~0); + img_i2c_writel(i2c, SCB_CLEAR_REG, ~0); + if (atomic) img_i2c_atomic_start(i2c); else if (msg->flags & I2C_M_RD) |